<template>
	<!-- 图片上传 -->
	<div class="component-upload-image">
		<el-upload ref="imageUploadRef" multiple :action="uploadImgUrl" list-type="picture-card"
			:on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :accept="fileAccept"
			:on-error="handleUploadError" :on-exceed="handleExceed" :before-remove="handleDelete" :show-file-list="true"
			:headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview"
			:class="{ hide: fileList.length >= limit }">
			<el-icon class="avatar-uploader-icon">
				<plus />
			</el-icon>
		</el-upload>
		<!-- 上传提示 -->
		<div v-if="showTip" class="el-upload__tip">
			请上传
			<template v-if="fileSize">
				大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
			</template>
			<template v-if="fileType">
				格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
			</template>
			的文件
		</div>

		<el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
			<img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
		</el-dialog>
	</div>
</template>

<script setup>
import { listByIds, delOss } from '@/api/system/oss';
import { propTypes } from '@/utils/propTypes';
import { globalHeaders } from '@/utils/request';
import { compressAccurately } from 'image-conversion';

const props = defineProps({
	modelValue: {
		type: [String, Object, Array],
		default: () => []
	},
	// 图片数量限制
	limit: propTypes.number.def(5),
	// 大小限制(MB)
	fileSize: propTypes.number.def(5),
	// 文件类型, 例如['png', 'jpg', 'jpeg']
	fileType: propTypes.array.def(['png', 'jpg', 'jpeg']),
	// 是否显示提示
	isShowTip: {
		type: Boolean,
		default: true
	},
	// 是否支持压缩，默认否
	compressSupport: {
		type: Boolean,
		default: false
	},
	// 压缩目标大小，单位KB。默认300KB以上文件才压缩，并压缩至300KB以内
	compressTargetSize: propTypes.number.def(300)
});

const { proxy } = getCurrentInstance();
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref('');
const dialogVisible = ref(false);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + '/resource/oss/upload'); // 上传的图片服务器地址
const headers = ref(globalHeaders());

const fileList = ref([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

const imageUploadRef = ref();

// 监听 fileType 变化，更新 fileAccept
const fileAccept = computed(() => props.fileType.map((type) => `.${type}`).join(','));

watch(
	() => props.modelValue,
	async (val) => {
		if (val) {
			// 首先将值转为数组
			let list = [];
			if (Array.isArray(val)) {
				list = val;
			} else {
				const res = await listByIds(val);
				list = res.data;
			}
			// 然后将数组转为对象数组
			fileList.value = list.map((item) => {
				// 字符串回显处理 如果此处存的是url可直接回显 如果存的是id需要调用接口查出来
				let itemData;
				if (typeof item === 'string') {
					itemData = { name: item, url: item };
				} else {
					// 此处name使用ossId 防止删除出现重名
					itemData = { name: item.ossId, url: item.url, ossId: item.ossId };
				}
				return itemData;
			});
		} else {
			fileList.value = [];
			return [];
		}
	},
	{ deep: true, immediate: true }
);

/** 上传前loading加载 */
const handleBeforeUpload = (file) => {
	let isImg = false;
	if (props.fileType.length) {
		let fileExtension = '';
		if (file.name.lastIndexOf('.') > -1) {
			fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
		}
		isImg = props.fileType.some((type) => {
			if (file.type.indexOf(type) > -1) return true;
			if (fileExtension && fileExtension.indexOf(type) > -1) return true;
			return false;
		});
	} else {
		isImg = file.type.indexOf('image') > -1;
	}
	if (!isImg) {
		proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`);
		return false;
	}
	if (file.name.includes(',')) {
		proxy?.$modal.msgError('文件名不正确，不能包含英文逗号!');
		return false;
	}
	if (props.fileSize) {
		const isLt = file.size / 1024 / 1024 < props.fileSize;
		if (!isLt) {
			proxy?.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
			return false;
		}
	}

	//压缩图片，开启压缩并且大于指定的压缩大小时才压缩
	if (props.compressSupport && file.size / 1024 > props.compressTargetSize) {
		proxy?.$modal.loading('正在上传图片，请稍候...');
		number.value++;
		return compressAccurately(file, props.compressTargetSize);
	} else {
		proxy?.$modal.loading('正在上传图片，请稍候...');
		number.value++;
	}
};

// 文件个数超出
const handleExceed = () => {
	proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传成功回调
const handleUploadSuccess = (res, file) => {
	if (res.code === 200) {
		uploadList.value.push({ name: res.data.fileName, url: res.data.url, ossId: res.data.ossId });
		uploadedSuccessfully();
	} else {
		number.value--;
		proxy?.$modal.closeLoading();
		proxy?.$modal.msgError(res.msg);
		imageUploadRef.value?.handleRemove(file);
		uploadedSuccessfully();
	}
};

// 删除图片
const handleDelete = (file) => {
	const findex = fileList.value.map((f) => f.name).indexOf(file.name);
	if (findex > -1 && uploadList.value.length === number.value) {
		const ossId = fileList.value[findex].ossId;
		delOss(ossId);
		fileList.value.splice(findex, 1);
		emit('update:modelValue', listToString(fileList.value));
		return false;
	}
	return true;
};

// 上传结束处理
const uploadedSuccessfully = () => {
	if (number.value > 0 && uploadList.value.length === number.value) {
		fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
		uploadList.value = [];
		number.value = 0;
		emit('update:modelValue', listToString(fileList.value));
		proxy?.$modal.closeLoading();
	}
};

// 上传失败
const handleUploadError = () => {
	proxy?.$modal.msgError('上传图片失败');
	proxy?.$modal.closeLoading();
};

// 预览
const handlePictureCardPreview = (file) => {
	dialogImageUrl.value = file.url;
	dialogVisible.value = true;
};

// 对象转成指定字符串分隔
const listToString = (list, separator) => {
	let strs = '';
	separator = separator || ',';
	for (const i in list) {
		if (undefined !== list[i].ossId && list[i].url.indexOf('blob:') !== 0) {
			strs += list[i].ossId + separator;
		}
	}
	return strs != '' ? strs.substring(0, strs.length - 1) : '';
};
</script>

<style lang="scss" scoped>
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
	display: none;
}
</style>
